Blogger “Anonymous Conservative” wrote this series of essays a while back to explain the overall motivations of leftists who seem bound and determined to destroy the societies in which they live. The short version is that they suffer, as a group, from narcissistic personality disorder that causes them to act as they do to protect their fragile ego structure from the harsh facts of reality. It is a sad fact that they will do anything to avoid facing the reality about who and what they are, including the destruction of Western Civilization.
I highly recommend this series of posts to better understand the motivations of the left and why you cannot reason with them. AC instead shows that you can fight against the left by using emotional manipulation tactics and he gives examples that show how this works.
It is vitally important for those of us who want to protect and preserve Western Civilization and our way of life to understand that we are fighting people who are deeply mentally ill and damaged in ways that normal people can barely conceive. Standard methods of debate and argument will not work with them because of their precarious mental state and the damage that they conceal from themselves and others. But we can beat them by using the alternate methods that Anonymous Conservative shows us in this series of posts. By understanding how these destructive and damaged people operate it is possible to undermine them and limit the damage that they would otherwise do.